221200120021111 has 32 divisors (see below), whose sum is σ = 292649988096000. Its totient is φ = 162075253670880.

The previous prime is 221200120021093. The next prime is 221200120021123. The reversal of 221200120021111 is 111120021002122.

It is not a de Polignac number, because 221200120021111 - 2⁴³ = 212404026998903 is a prime.

It is a super-2 number, since 2×221200120021111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200120061111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058380711 + ... + 1058589688.

It is an arithmetic number, because the mean of its divisors is an integer number (9145312128000).

Almost surely, 2^{221200120021111} is an apocalyptic number.

221200120021111 is a deficient number, since it is larger than the sum of its proper divisors (71449868074889).

221200120021111 is a wasteful number, since it uses less digits than its factorization.

221200120021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116970499.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221200120021111 its reverse (111120021002122), we get a palindrome (332320141023233).

The spelling of 221200120021111 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty million, twenty-one thousand, one hundred eleven".